PACCAR MX (2004 Emissions) Fault Code: U1848 EAS-3 ECU Software Verification – Incorrect
PACCAR MX (2004 Emissions) Fault Code: U1848 EAS-3 ECU Software Verification – Incorrect
SET CONDITIONS:
The PCI ECU detects that no or an incorrect calibration verification number (CVN) is received from the EAS-3 ECU.
DIAGNOSTIC CONDITION:
This diagnostic runs once when the ignition is keyed on.
CORRESPONDING OBD READINESS MONITOR:
None
RESET CONDITION:
This DTC changes to inactive next time the ignition is keyed on and the fault is no longer detected.
REPAIR VERIFICATION:
1. Clear all DTCs.
2. Test drive or operate the vehicle to meet the diagnostic conditions and set conditions.
3. Did the DTC come back? (Can be pending, inactive or active)
– No, repair successful
– Yes, repair unsuccessful
POSSIBLE CAUSES:
No or intermittent CAN communication with the EAS-3 ECU
ADDITIONAL INFORMATION:
When the ignition is keyed on, the PCI ECU (D420) queries the EAS-3 ECU (D374) for a calibration verification number (CVN)
CVN is the calibration verification number and is the result of a check performed on the software values stored in emission-related ECUs (OBD legislation).
